Circulating Lubrication Systems (Oil)

Transcription

1 Circulating Lubrication Systems (Oil) US Screw-in Restrictors, Metering Valve Distributors, Flow Volume Dividers Screw-in restrictor Metering valve distributor Flow volume divider SP/SMT (cf US) A continuous flow oil is often necessary for the lubrication or cooling of machines or systems requiring large amounts of oil. This flow is produced by gear, gerotor, vane and piston pumps and then distributed to meet the needs of the individual lube points. The system is very simple if there is only one lube point to be supplied. But if the lubricant is to be delivered to a of lube points in equal quantities or certain proportions, there are several possibilities entailing different expenses and effects. If must be remembered that circulating lubrication systems require an oil return line from the lube points to the oil reservoir. Adequate filtering of the oil must be provided for. Restrictors, especially for small amounts of oil, are sensitive to dirt. Layout of a circulating lubrication system (printing machine) with progressive feeders MQUALITY MANAGE ENT

2 Circulating Lubrication Systems (Oil) US 2 Distribution systems System description 1a Restrictor tubes 1b Screw-in restrictors and adjust. metering valve distributors A pump supplies a network of lines connected to all the lube points via manifolds and branch lines. The quantity is apportioned in inverse proportion to the resistance of the restrictor tubes, screw-in restrictors or metering valve distributors. Screw-in restrictors can be installed on manifolds (cf. leaflet US or screwed directly into the threads of the lube points. 1 1c 1c Flow monitors with choke System similar to 1b, but the interchangeable metering valve is installed upstream of a flow monitor in which an electrical contact is actuated by a piston moved by the oil flow. The contact returns to its neutral position when there is oil pressure without a simultaneous flow of oil. See leaflet US Progressive feeders 2 The flow from the pump is divided up by a feeder. The flow from this master feeder can be further divided up for up to a total of some 100 lube points by way of downstream progressive feeders. See leaflet US 3 Multi-circuit pumps Multi-circuit pumps (e.g. 2, 4, 5, 8, 10, 20 zones) supply the lube points direct with prespecified quantities of oil that correspond to the pumps' delivery rates. It is possible to work with or without priming pressure, depending on the operating pressures and accuracy requirements to be expected. Subdistribution of the individual zones is possible in accordance with systems 1 and 2. See leaflet US Auxiliary equipment for systems 1a and 1b is specified in this leaflet. Flow volume divider, type SP/SMT for circulating lubrication systems (oil) cf. leaflet US.

3 Circulating Lubrication Systems (Oil) US 3 Volumetric flow per lube point Permissible operating pressure [bars] Max. of lubrication points Monitoring General remarks and criteria 1a a few ccm to several l/min Screw-in restrictors: ccm/min Metering valve distributors ccm/min Unlimited in practice. Tubing cross sections and pump have to be adapted. No monitoring of individual points, pressure can only be monitored in the main line. For an even distribution of oil provide for the most symmetric layout possible. Lay tubing with the largest possible cross sections from the pump to the junctions. When individual points require different amounts of oil, change the lengths or cross sections of the restrictor tubes to obtain the respectively needed quantity. Inexpensive, reliable, insensitive to dirt. Planning is complicated when extensive, asymmetric systems with different oil needs are involved. 1b 1c Restrictors can clog up when unfiltered oil is used. It is therefore necessary to install a microfilter upstream in the systems, preferably with a dirt indicator. Planning and quantity regulation easy. The pressure losses in the tubing have to be taken into account when the system is designed l/min 5-25 Oil flow is monitored. An alarm is triggered if the flow drops below the bottom limit of the range for the flow monitor selected. 1a 1b 1c Metering imprecise with fluctuating and varying back pressures. Often of no importance in circulating lubrication systems not used for cooling purposes at the same time. The systems do not depend on the viscosity. a few ccm to 1 l/min Pressure should not exceed 100 bars in circulating lubrication systems. 2 to roughly 100 Central monitoring of functions of all distributors easy since system-related. Pulsating oil current. Very exact apportioning of quantities, even with back pressures. Planning complicated, especially changes at a later date. The systems depend on the viscosity. Easy to plan l/min per outlet 20 or 80 depending on pump 2, 4, 5, 8, 10, 20 zones per pump Monitoring of one or more strings of lines with flow monitors or the like possible. A monitored string of lines already shows the pump is operating and lubricant is available. The lower the pressure difference between the priming pump and distributing pump the more even the delivery rates are in relation to each other.

4 Circulating Lubrication Systems (Oil) US 4 Screw-in restrictors Screw-in restrictors are used to deliver relatively small amounts of oil to the lube points. The sizes are identified by s. The diagrams show the flow rates of the individual sizes as a function of the pressure and as measured with an operating viscosity of the oil amounting to 140 mm 2 /s. The flow rate varies with the viscosity. Depending on the position of the embossed direction arrow, the restrictors can either be combined (cf. leaflet US) and fitted to manifolds (types A and D) or directly screwed into the ports of the individual lube points (types B and C). Special attention must be paid to the use of clean oil, the recommended filter size being 10 µm. Screw-in restrictors of types C and D additionally contain one check valve each that can help to prevent leaks, for instance. The scope of delivery also covers union nuts and tapered rings when types C or D are ordered. Type A Type B for tube Code Order No. diam. VD VD VD VD VD VD VD VD Washer, order No for tube Code Order No. diam. VD VD VD VD VD Washer, order No flow rate [ccm/min] Durchflussmenge [cm 3 /min] pressure [bars] pressure [bars] Port tapped for solderless tube connection. SW = width across flats Type C Type D 3 2 for tube Code Order No. diam. VD VD VD VD Tube connection acc. to DIN 2353 for tube Code Order No. diam. VD VD Washer, order No. DIN7603-A8x11.5-CU flow rate [ccm/min] pressure [bars]

5 Circulating Lubrication Systems (Oil) US 5 Connecting piece with restrictor (complete with washer) Code No. Code No. Nomograph for determination of restrictor size for tube Connection Code Order No. diam. thread 1 ) No. GD60 60 GD61 61 GD M12x1.5 GD63 63 GD64 64 GD65 65 GD80 80 GD81 81 GD82 82 GD83 83 GD M14x1.5 GD85 85 GD86 86 GD87 87 GD88 88 GD ) Ports tapped for solderless tube connection to DIN 2353 (cutting sleeve) Determining the restrictor size 1. Draw a straight line along the index lines through point Q eff. 2. Determine the point at which p intersects with this line, resulting in D. 3. Select the restrictor closest to point D. D must be inside the white field, i.e. small amounts cannot be apportioned and monitored with the unit. Operating viscosity ν eff.[mm 2 /s] Lubricant quantity Q [ccm/min] Code No. min. system pressure Pressure p [bars] Example 1 required: Q = 36 ccm/min, given: ν eff = 280 mm 2 /s, p = 7 bars Result: restrictor size No. 60 (borderline case) Example 2 required : Q = 260 ccm/min, given : ν eff = 480 mm 2 /s, p = 8 bars Result: restrictor size No. 80 Operating viscosity ν eff.[mm 2 /s] Lubricant quantity Q [ccm/min] min. system pressure Pressure p [bars]

6 Circulating Lubrication Systems (Oil) US 6 Metering valve distributors These metering valve distributors are used If an infinitely variable adjustment of the flow rate per lube point is required even at a later date. In the case of type A for flow rates within the drop-feed range knurled lock nuts and knurled screws are provided for adjustment purposes. It is necessary to provide for a sufficiently large drain-off in order to maintain a free fall of drops in the sight glass. In the case of types B and C, the continuous flow rate is adjusted after the upper hexagonal lock nut is loosened. Spring-loaded metal pins in sight glasses indicate that oil is flowing when they move away from the mark. B spacer Characteristic values of the metering valve distributors operating pressure bars viscosity range to 1000 mm 2 /s temperature range to +60 C mounting position as shown Output range type A to 10 ccm/min type B to 1000 ccm/min type C to 2000 ccm/min Indicating range for types B and C at 110 mm 2 /s commencement of indication... at 10 ccm/min end of indication.... at 1000 or 2000 ccm/min Number of Dimensions in mm Order No. lube points l1 l2 l Adapter for main tube: 6 mm diam. tube, order No mm diam. tube, order No mm diam. tube, order No Screw plug, order No Washer, order No CU for 6 mm diam. tube A C spacer spacer for 6 mm diam. tube for 10 mm diam. tube Number of Dimensions in mm Order No. lube points l1 l2 l Adapter for main tube: 6 mm diam. tube, order No mm diam. tube, order No mm diam. tube, order No Screw plug, order No Washer, order No CU Number of Dimensions in mm Order No. lube points l1 l2 l Adapter for main tube: 10 mm diam. tube, order mm diam. tube, order Screw plug, order No Washer, order No. DIN7603-A18x22-CU 1) Ports tapped for solderless tube connection

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8 Willy Vogel AG Motzener Strasse 35/ Berlin, Germany P.O.Box Berlin Tel. +49 (0) Fax +49 (0) Notice! All products from VOGEL may be used only for their intended purpose. If operating instructions are supplied together with the products, the provisions and information therein of specific relevance to the equipment must be observed as well. In particular, we call your attention to the fact that hazardous materials of any kind, especially the materials classified as hazardous by EC Directive 67/548/EEC, Article 2, Par. 2, may only be filled into VOGEL central lubrication systems and components and delivered and/or distributed with the same after consultation with and written approval from VOGEL. All products manufactured by VOGEL are not approved for use in conjunction with gases, liquefied gases, pressurized gases in solution and fluids with a vapor pressure exceeding normal atmospheric pressure (1013 mbars) by more than 0.5 bar at their maximum permissible temperature. Willy Vogel AG 2. Industriestrasse Hockenheim Germany Tel. +49 (0) Fax +49 (0) info@vogel-berlin.de Vogel France SAS Rue Robert Amy, B.P Saumur cedex France Tel. +33 (0) Fax +33 (0) info@vogelfrance.com Subject to change without notice! /2003